Abstract
In investment casting (IC) process, the mould is subjected to stress due to both internal pressure of the molten metal and the thermal stress generated due to the temperature variation across the mould boundary at the time of pouring and during solidification. The solidification pattern and solidification time have predominant effect on the material properties of the casting produced from this process. In the present work, an IC ceramic shell is used as mould for the numerical simulation of the thermal stresses generated and solidification process of Al-7%Si alloy inside it using COMSOL Multiphysics software. The effect of heat transfer coefficients between the casting and ambient air on the solidification pattern and solidification time have also been simulated. The results obtained from the simulation were found to be in good compliance with the data obtained from the experimentation and literature survey. Therefore, this modeling provides promising possibility for the predetermination of casting defects in mould as well as in casting.
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